MediaWiki:Sitenotice:
2025-12-29: I have restored the wiki to a backup from the end of November. Starting in September 2025, accesses went form the 800MB-1.2GB range per month to 26GB in September, 42GB in October, and 70GB in November with most accesses originating from China. As soon as I realized what was causing all the access problems in November, I shut it down (it had reached 36GB by then) behind a password/login screen. The database had gotten corrupted, and I tried a restore from just before the spike in access but that didn't work. Thus, end of November. I still have the other daily backups so if there were any important additions in December, let me know and maybe they can be recovered. - Allen H.
Multi-Pak Interface
| WELCOME |
|---|
| Looking for CoCo help? If you are trying to do something with your old Color Computer, read this quick reference. Want to contribute to this wiki? Be sure to read this first. This CoCo wiki project was started on October 29, 2004. --OS-9 Al |
See Recent Changes. | About this site. | Join the E-Mail List or Facebook Group. | Contact me with updates/questions.
This page was last updated on 02/25/2015. Total Pages: 747. Total Files: 997.
Home / Hardware - Multi-Pak Interface
The MULTIPAK is a peripheral that plugs into the slot of expansion of the Color Computer (cartridge port) and expands it to handle up to 4 cartridges interchangeable and can be used one at a time without having to put out one another, this exchange of the 4 slot can be done without shutting down the computer, but sometimes need to use the reset, you can even do some things with several at once
Exist the following models:
- 26-3024 Grey
- 26-3024 White
- 26-3124 White
- 26-3124A White
There are also custom made MULTIPAK and 8 Slot MULTIPAK
To use these MULTIPAK smoothly with Color Computer 3, use this:
Upgrading 26-3024 MPIs uses a PAL/GAL chip programmed for the CoCo 3's addressing pattern.
Upgrading the 26-3124 involves trace cutting and wiring in a 74LS10 chip to change the addresses.
To make a 20-3024 MPI work with both a CoCo 1/2 and a CoCo 3 requires a piggybacked PAL/GAL with a switch to activate one or the other. I'm sure someone can figure out some circuitry to switch the 20-3124 type MPI.
Neither setup is stable with the other CoCos. IE; once you upgrade to the CoCo 3 address set, your CoCo 1/2 will be unreliable with that MPI.
26-3124 MPI CoCo 3 Upgrade #1 26-3124 MPI CoCo 3 Upgrade #2
26-3024 mpi coco 3 upgrade By Robin W. Drake
Besides the two that provides Cloud-9 hardware Upgrade PAL Multi-Pak, but you have to send the MULTIPAK.
The disk controller must be used in slot 4, and while you can use
two disk controllers in the mpi problems exist
Link
- Multi-Pak Interface Owners Manual (Tandy)
- Multipak 26-3124 for then color computer 2 Owners Manual
- 8-slot-mpi-multi-pak-interface-design
Video
- YouTube Atarileaf Package Video November 1 2010
- YouTube Atarileaf with a joke about MULTIPAK in the movie the fifth element
- Custom Multi-Pak You Tube Tom Interface for the Tandy Radio Shack Color Computer
Mod
The 74LS10 can be mounted on another (??), and attach the pin 7 & 14, with pin 7 & 14 of the mounted chip
(26-3124)
